Electric bell.



PATENTED MAR. 3, 1908.

C. J. WAGNER.

ELECTRIC BELL. I APPLIOATION FILED AUG.15, 1907.

CHARLES JULIUS WAGNER, OF CHICAGO, ILLINOIS.

ELECTRIC BELL.

Specification of Letters Patent.

Patented March 3, 1908.

Application filed August 15, 1907. Serial No. 388,581.

T 0 all whom "it may concern:

Be it known that I, CHARLES JULIUs WAG- NER, a subject of the Emperor ofAustria- Hungary, and residing at Chicago, in the county of Cook andState of Illinois, have invented a new and useful Improvement inElectric Bells, of which the following is a complete specification.

This invention relates to improvements in electric bells, and moreparticularly to an electric bell adapted for use with alternatingcurrents.

The object of this invention is to provide a very quick actingbell'which will readily respond to the pulsations of the currents andproduce a loud and clear sound.

It is a further object of the invention to provide an electric bell inwhich an oscillating permanent magnet controls the hammer and isprovided with means which not only gives it a quick action, but alsoacts to nor mally center the hammer and hold the poles of the permanentmagnet out of contact with the core of the electro-magnet when thecurrent is off.

It is a further object of the invention to provide a very cheap andsimple construction in which the permanent magnet is so balanced that itwill operate under the influence of weak as well as strong currents.

The invention consists of the matters hereinafter described in thespecification and more fully pointed out and defined in the appendedclaims.

In the drawings: Figure 1 is a top plan view of a device embodying myinvention. Fig. 2 is a side elevation thereof. Fig. 3 is a perspectiveview of the permanent magnet and the pivoted bearing therefor.

As shown in said drawings: 1 indicates a base plate of marble, porcelainor any other preferred insulating material, upon which the operatingparts of the bell are mounted. The core 2 of the electro-magnet isrigidly engaged near its ends in suitable supports 3 of wood or othernon-conducting material, and which, as shown more clearly in Fig. 2, areslotted so that when they are engaged to the base plate by means of thebolts 4, which extend therethrough, they firmly grip the core in place.Upon said core is wound the coil 5 and the ends thereof are engaged inthe binding posts 6 by means of the binding screws 6.

A U shaped permanent magnet 7 is pivotally supported at its center tosaid base spect to the trunnion 8, and permitting the magnet to beremoved when desired. The arms of said permanent magnet project past theends of the core 2 and are provided, in

alinement with said core, with screws 10 each of which has a point 11 ofbrass or other nonconducting material adapted to engage the core andprevent the magnet 7 from clinging thereto. Coiled springs 12 areengaged be tween the supports 3 and the arms of the permanent magnet andact normally to center the magnet 7 with respect to the core 2.

Rigidly engaged on the base plate by means of the stems 13 are the bells14 which are spaced a distance apart, and a hammer 15 is engaged to themagnet 7, adjacent its pivotal point, and projects between said bells inposition to alternately strike the same when said magnet is oscillated.

The operation is as follows: When an alternating current is sent throughthe electromagnet the arms or poles of the permanent magnet arealternately attracted and repelled by the core 2, thereby causing saidperma nent magnet to oscillate on its pivot and cause the hammer toalternately strike said bells.

Obviously a bell constructed in accordance with my invention is adaptedto strike in very rapid succession with a minimum amount of current andis not liable to get out of repair. Obviously also many details ofconstruction may be varied without departing from the principles of myinvention.

I claim as my invention:

1. In a device of the class described the combination with anelectro-magnet, of a U shaped permanent magnet pivoted adjacent thereto,springs between the arms of the permanent magnet and the electro-magnet,a centrally disposed hammer on said permanent magnet and bells adaptedto be engaged by said hammer.

2. In a device of the class described the combination with anelectro-magnet of a U shaped permanent magnet having its poles I aspring between each pole of the permanent I magnet and theelectro-magnet, an adjustable pivot for said permanent magnet and a pairof bells adjacent said hammer.

3. In a device of the class described the combination with a base plateof a bracket thereon, oppositely directed trunnions on said plate, a Ushaped permanent magnet pivoted at its center on said trunnions, ane1ectro-magnet rigidly engaged on the plate between the poles of saidpermanent magnet, springs normally holding the poles of said magnets outof contact, a hammer on said permanent magnet and bells adjacent there-I to adapted to be struck by said hammer.

4. In a device of the class described the combination with a base plateof a pair of oppositely directed trunnions thereon, one of which isadjustable with respect to the other, a U shaped permanent magnetpivoted at its center on said trunnions, an electro-magnet rigidlyengaged on said plate intermediate the poles of the permanent magnet,means acting normally to hold the poles of the permanent magnet out ofcontact with the core of the electro-magnet, adjustable contacts on thepoles of the permanent magnet, a hammer engaged on said permanent magnetat its pivoted point and extending outwardly therefrom and a pair ofbells on said plate adapted to be engaged by the hammer.

5. In a device of the class described the combination with a base plateof a bracket thereon, a pair of trunnions on said bracket, one of whichis adjustable with respect to the other, a U shaped permanent magnetpivoted on said trunnions, an electro-magnet rigidly engaged on saidplate, a spring between each end thereof and the permanent magnet, apair of stems on said plate, a bell on each stem and a hammer on saidpermanent magnet projecting between said bells.

In witness whereof I have hereunto subscribed my name in the presence oftwo witnesses.

CHARLES JULIUS WAGNER.

Witnesses:

AUG. STINE, JonAN PFEIFER.

